The SP's don't have rear passenger pegs, why don't you post up some pics?
I guess if someone wanted to pass off a used bike as a new one it would be easy enough. Clean it up, new tires, set the ODO to zero miles. What tires did it have on it? I don't know how many of the 2017's came with zero miles on them, usually a shakedown test ride by the dealer was mandated. New chains usually come with a thick white pasty grease on them, the whole chain looks white.